[New] Geocode offline

[CalebRas]

Description

This PR implements Geocode offline in Search and Query category.
URL to README: README

Linked Issue(s)

• swift/issues/4643

How To Test

• Note: As of creation, this requires swift-toolkit-daily to compile.
• Tap a location on the map to reverse geocode.
• Enter an address in the search bar and press "Enter" to geocode.
• Tap the arrow button in the toolbar and select an address from the list to geocode.

Screenshots

To Discuss

• I implemented the example addresses using a toolbar button instead of with the native suggestions (.searchable(text:placement:prompt:suggestions:)) because there is a bug in iOS 17 where the suggestions don't disappear when one is selected or when "Enter" is pressed, making them useless. Related Apple Developer Forum post here.

[rolson]

Looks good. Minor comments. I think ideally there would be some error reporting if (reverse) geocode fails. But no big deal either way. Nice sample

[yo1995]

My suggestion would still be moving the callout placement to the view, but OK if the other reviewers agree to keep it as-is. Other than that the changes look good.